Improvement in panning-mill



H. A. SNYDER. Fanning Mill.

Patented Sept. 8, 1868.

N. PETERS. PNOTmLITMOGRAPME H. A. SNYDER, OF SHULLSBURG, WISCONSIN.

Letters Patent No. 81,955, dated September 8, 1868;

IMPROVEMENT IN FANNING-MILL.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, H. A..SNYDER, of Shullsburg, in the county of Lafayette, and State of Wisconsin, have invented a new and improved Fanning- Mill; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawings, forming a part of this specification, in which- Figure 1 is a front view of my improved fanning-mill.

Figure 2 is an end view of the same, having a portion of the case removed to exhibit the interior mechanism.

I have shown in the drawing only the fan and cylinder of a fanning-mill, and, as my invention is confined to improvements therein, I do not think it necessary to show the sieves and other portions of the machine.

'Similar letters of reference indicate corresponding parts.

The object of this invention is to provide a governor for fanning-mills, which shall act automatically, to prevent the grain from being blown over the sieves when the fan is driven with very high velocity, or to so adapt itself to a low velocity, that the grain will be perfectly cleaned in that case.

It consists of a hinged board forming part of the box or cylinder, the said board being suitably connected with the gates which admit air'to the box, that the movement of the said gates to shut olf the egress of air to the box is dependent upon the movement of the hinged board, which latter is itself actuated to movement by the antagonistic forces of the spring, and the current of air developed by the fan-wheel. When the force of the' current of air exceeds that of the spring, the board rises, and being connected with the gates, actuates them to shut off a portion of the entering air, but when the force of the spring is in excess, the board tends to approach the outer ends of the fans, and in so doing moves the gates to admit a greater supply of air.

This feature will be more clearly set forth by reference to the accompanying drawings, in which-- A'is the'box; and B the hinged board forming part of the same, and located near the top, so as to be in proper relation to the blast-board C and the sieves, when the fanning-mill forms part of a threshing-machine.

D is the spring, which is so arranged as to actuate the board 13 towards the end of the fans E.

The movement of the board towards the fans is limited by any suitable stop-device to prevent it from quite touching the fai s. The movement of the board from the fans is opposed and finally limited by the tension of one or more-springs, D, of any suitable form or arrangement. The tension of the spring is adjusted by a burr, a, or other suitable device readily devised by those skilled in mechanism.

G and H are the gates at each end of the box, and regulate the ingress of air into the box through the usual apertures I. The gates G are free to be operated by hand, but the lower gates, H, are connected with the hinged board by means of rods or cords b, or other suitable means, which latter may be variously modified without adding to the general merits of the invention.

The gates, H, are pivoted to the box, and are proneto drop down and uncover the aperture I by means of ;gravity,but are lifted to cover the said aperture, when the board B is raised, by the excessive power of the blast or current over the antagonistic force of the spring D.

By means of the burr a the tension of the spring is regulated to leave the gates Hat their maximum open ing, when the fans are driven at their minimum effective velocity, and developing the minimum efi'ective force of current or blast, but as the blast increases iii-power, it partially impinges (in its passage from the box) against the hinged board B, and raises it against the tension of the spring, and raises the gates H to shut over the apertures I; the gate being thus made to act as governing-valves.

By this means the fan-wheel may be'driven with variable velocity, and a blast of variable force would be otherwise developed, but the automatic action of the gates prevents the egress ofthe air, and thus controls the power of the blast.

d d are guide-plates for the gates G and H.

Having thus described my invention, what I claim as new, and desire to secure-by Letters Patent, is-

The hinged board B, actuated by spring-tension acting against the blast of a fanning-mill, and connected with gates or valves H closing the ingress-aperture I of the fan-wheel box A, all substantially as shown and described, and for the purpose set forth. a

The above specification of my invention signed by me, this day of 1868.

H. A. SNYDER.

Witnesses:

N. SANFORD, G. P. SIMMONS. 

